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Desktops advertise client-keepalive-v1; the edge offers it after the hello-ack and auto-responds to a fixed keepalive frame, so idle hosts need no 25 s ping alarm (each setAlarm is a billed row write). Silent keepalive hosts are probed with one relay ping before a phone is refused, closed at once where the host is leaving. Shipped desktops and cells see nothing new. Kill switch CLIENT_KEEPALIVE=0.